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Techniques for Creating Accessible, Closed Captioned Web-Based Video California State University - Northridge 21st Annual International Technology and.

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Presentation on theme: "Techniques for Creating Accessible, Closed Captioned Web-Based Video California State University - Northridge 21st Annual International Technology and."— Presentation transcript:

1 Techniques for Creating Accessible, Closed Captioned Web-Based Video California State University - Northridge 21st Annual International Technology and Persons with Disabilities Conference Los Angeles, California March 22, 2007 http://disability.law.uiowa.edu/lhpdc/publications/kleinpubs.html David Klein K. “Fritz” Thompson

2 QuickTime Text Track Embedded Open (Burned In) Captioning  QuickTime Pro required  Embedded in video file itself  Video & captions self-contained  Hard to modify  Captions can’t be eliminated without separate video or script  Easier to deploy (1 file), unless script used  May start faster in browser

3 Embedded Closed Captioning QuickTime Text Track  Demo of embedding text track into QuickTime (see “extras” folder on CD)  Also see WebAIM: http://www.webaim.org/techniques/captions/q uicktime/add_captions.php http://www.webaim.org/techniques/captions/q uicktime/add_captions.php http://www.webaim.org/techniques/captions/q uicktime/add_captions.php  Also see Accessible Digital Media http://ncam.wgbh.org/publications/adm/index. html (link in Resources page) http://ncam.wgbh.org/publications/adm/index. html http://ncam.wgbh.org/publications/adm/index. html

4 QuickTime Captioned Video  SMIL file option  Requires 3 files  Relatively easy to modify captions and video  Video and caption files can be reused  Captions separate, so  Can be eliminated  Easy to edit  Can be reformatted  Harder to deploy than open captioned QuickTime

5 Embedded Captioned Video – Multiple Files Embed in HTML File ServerClient Video File Caption File Combine Files in Player

6 QuickTime Captioning & Deployment Files  Video .mov file and others (.mpg,.m4v, etc.)  Caption file .txt  QuickTime caption file format  SMIL .smi,.sml, or.mov  Integrates video and caption files  HTML  Integrates video, captions, player, text, other files

7 Final Assembly (QuickTime)  The video - videoname.mov  The caption file – videoname.en_US.qt.txt  The SMIL file – videoname.sml  Avoid.smi file extension .mov or.sml extension elicits QT playback  Captions display automatically as part of SMIL standard

8 SMIL File Characteristics  Use XML standards (mostly)  Tags case sensitive  All elements closed  xxx (open and close tags)  (no explicit close tag; use the slash)  “SMILText” identifier specific to QuickTime playback

9 SMIL File Layout SMILtext SMILtext

10 SMIL File  “SMILText” tag, encoding, QuickTime association  Header  Metadata (video name, copyright info)  Player layout (“region” sizes, background / text colors)  Container IDs for linking parts  Body  Video duration  Start (and end) times  File locations  Links to regions

11 SMIL and the Player Layout Root Layout Video region Text region

12 SMIL File Activity  Handout: QuickTime SMIL Activity - Assemble files  Objective: Modify MAGpie files to assemble a captioned QuickTime video.


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